Photographic apparatus



y 1932- E. WEISKER 1,858,423

PHOTOGRAPHIC APPARATUS Filed April 10, 1931 Patented May 17, 1932 UNITEDSTATES PATENT OFFICE Application fled April 10,

The invention relates to photo phic aparatus, more articularly as utiized in enargement wor and. also of the type employed in so-calledphotostatic work where a reproduction of copy is made directly 3)011 asensitized paper or other more or less exible material or film. It hasbeen the general practice in the making of enlargements and hotostats tofirst properly focus the camera i y viewing the ima on a ground glass orlike surface and t en replace the gropnd glass by a box or framecarrying sensitized I material disposed in the foca plane of said lass.g It is the object of the present invention to combine the focussing andsensitized material retaining elements, making thereby unnry theinsertion and removal of a ground glass or like member as well as a mswi or moving of the sensitized material c into lplace, or the use of aplate holder or the li e therefor.

A further object of the invention resides in the provision of a combinedfocussmg screen and retainin member which embodies a pluralit of fixseparated focussmg ele-- ments an intermediate vacuum-providing meanswhich are adapted to retain the sensitized material temporarily to thefocussing screen.

A still further object of the invention resides in the rovision of meanswherzzly the vacuum hol 'ng means may be locali substantiall to theparticular area co nda in .to t e size of sensitized material to be Astill further object of the invention resides in a novel construction ofthe surface of the retainin elements and whereby a n more eflicient gripis attained upon the material held.

In ca g out the invention, a plurality of focussmg elements, such asglass panels und on one face, are fixedly secured in a rame adjacentlyone another but spaced to afiord openings for the introduction ofvacuum-providing means. These vacuum-providing'means may be fixedlylocated between the ground glass panels, or they may be arpa ranged tomove over the unground surface of the panels and be adapted forinsertion as required into the spaces between panels to afiord a vacuumsubstantially in the focal plane of the'ground glass sur aces.

In the former embodiment, as well as in the latter, provision may bemade for cutting oil the vacuum to a desired suction-afi'ording member.

The active holding surface of a vacuumproviding member may, furthermore,be lonitudinai y grooved at intervals, the grooves wing in communicationwith the vacuum orifice. This arrangement provides for a betterretaining action.

The present invention is a continuation in part of my rior application,Serial No. 224,289, filed tober 6,1927.

In the accompanying drawingswhieh illustrate the invention, .Fig. 1illustrates, in perspective, the front of the novel combined ocussingand retaining member and shows also a sheet of sensitized material inposition thereon.

Fig. 2 is a fragmentary rear view thereof.

Fig. 3 is a fragmentary transverse section, on an enlarged scale, andtaken on the line 3-3, Fig. 2 of the drawings.

Fig. 4 is a fragmentary transverse section and illustrates amodification.

Fig. 5 is a perspective fragmentary view of a rtion of the retaining andvacuumprovi mg member.

Fig. 6 is a rear elevation illustrating a modification in the combinedfocussing screen and retaining member.

Fig. 7 is a fragmentary transverse section thereof on an enlarged scaletaken on the line 7-7, Fig. 6 of the drawings.

Fig. 8 is an enlarged fragmenta horizontal section, partly in elevation,i ustratin the manner of inserting the vacuum;provi ing means in itsoperative position with react to the focussing elements.

ferring to the drawings, 10 designates a frame or rectangular structurewhich may be supported in any suitable manner for use with an enlargingor photostatic camera (not shown). Within the said frame is fixed,either horizontally as indicated in Figs. 1 and 2, or vertically asindicated in Fig. -6, a 1

plurality of adjacently disposed spaces in which are located tubes 12havin suction openings 13 substantially flush wit the ground surface ofthe panels. In the embodiments indicated in F1 1 to 4, these tubes arein fixed relationship with respect to they panels 11 and are further incommunication with a header or like member 14 adapted for connection, asthrough the hos- 15, with suitable vacuum roducing means (not shown). Bythis expe 'ent, suction is provided in the various tubes 13 over theface of the focussin member comprising a lurality ofvad'acent y disposedpanels 11.

f it be d tolocalize the holding action to the particular area of thesurfaces required for retaining a piece of sensitized material 16, as ofcomparatively small size relatively .to the apparatus, provision may bemade for cutting off certain of the tubes 13 which are not required. Forexample, referring to Fig. 4 of the drawings, the outlet from a header14 may be provided with a valve 21 operable by turning the head 22 ofthe stem 23 thereof, which stem is threaded into the outer wall oftheheader, as indicated. Thus, not only may the suction be regulated tothe particular degree but the same may be entirely out off from thosesections of the panels which are not employed for holding of thesensitized material 16.

It is not necessary, however, that these vacuum affording means bemaintained in fixed relationship to the anels, and in Fig. 6 an arranent is disc osed whereby a plurality 0 tubes 25 are movably mounted overthe back of the ground glass anels 26 which are provided with intermeiate spaces 27 For example, the tubes may be slidazlig mounted upon apair of upper and lower r 28 and are individually connected throughhoses 29 and 30 to different sets of sources of vacuum 31 and 32. Bygrouping the vacuum supplies in this manner, a more uniform vacuum isattainable at the ground glass surface of the panels; and valves 33 and34 may be provided in the respective hose connec tions to limit thevacuum to the particular sections of the panels desired for holding. Itis to be understood that the tubular members 25 are similarly providedwith longitudinally disposed perforations 35 and that the tubes arearranged to be inserted in the spaces 27 with their openings 35 broughtsubstantially flush with the ground glam surface of the anels.

Y may be accomplished readily by slidably mounting the tubes on rods 36extending toward the panels from the blocks 87 slidable on the rods 28.In Fig. 8, the full-hue position indicates atube m position forretaining a strip of, sensitized materialto the panels and the showingin dotted lines indicates its position when retracted to permit ofmovement over the back of the panels.

The holding surface of the aforesaid tubular retaining members ma beconstructed to afford a more uniform an satisfactory holding if the samebe gouged out or ved longitudinally to provide a succession of adjacentgrooves 40, Fig. 5, with intermediate smoot portions 41 representing thenormal outer surface and designed to lie substantially flush with theground lass surface of the panels. The grooves 40, rthermore, arearranged to be in communication with a perforation 42 from the interiorof the tube and will thus distribute the suction along the series ofgrooves for 'the particular group, end transverse grooves 43 being alsoarranged to allow for intercommunication, as wel as a transverse groove44 at the perforation 42. The latter transverse groove, however, doesnot extend to the final side grooves of a group as it would tendotherwise to reduce thereby the effective vacuum.

I claim:

1. A combined focussing screen and retaining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and means to apply suction to one surface of the sections through theinterveninfi spaces.

2. combined focussing screen and retaining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and intermediate vacuum-providing means operating substantially in thefocal plane of said sections.

3. A combined focussing screen and retaining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and intermediate movable vacuumproviding means operating substantiallyin the focal plane of said sections.

4. A combined focussin screen and retaining member for sensitizematerial, comprising a plurality of ground glass panels separated fromone another, and vacuumroviding means located in the interm late spaces.

5. A combined focussin screen and retaining member for sensiti material,comprising a series of fixed, separated translucent sections,intermediate vacuum-providin means operating substantially in the focaplane of said sections, and means to control the suction in saidvacuum-provid' means.

6. A combined focussing screen an retaining member for sensitizedmaterial, comprising a frame, a plurality of ground glass panels fixedlymounted therein and separated from one another, and vacuum-providing 5means movable over the back of the frame and adapted to be inserted inthe said spaces between panels.

7 A combined focussing screen and retaining member for sensitizedmaterial, comprising a frame, a plurality of ground glass panels fixedlymounted therein and separated from one another, and vacuum-providingmeans movable over the back of the frame and including a tube slidablealong the back of the frame and slidable also in a direction at rightangles to its sliding motion on the frame, said tube beinglongitudinally perforated at its forward face and adapted to fit in thespaces between the glass panels with perforations ubstantially flushwith the ground surface thereof.

8. A combined focussing screen and re taining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and intermediate vacuunrproviding means including a tubular memberperforated longitudinally and having a succession of surface groovesabout a perforation and communicating therewith.

9. A combined focussing screen and retaining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and intermediate vacuum-providing means including a tubular memberperforated I 35 longitudinally and having a succession of longitudinalsurface grooves about a perforation and communicating.therewith, andintermediate flat surfaces.

10. A combined focussing screen and re- 40 taining member for sensitizedmaterial, comprising a series of fixed, separated translucent sections,and intermediate vacuum-providing means including a tubular memberperforated longitudinally and having a succession of 45 longitudinalsurface grooves about a perforation and transverse surface groovescommunir \ting with the longitudinal grooves.

In testimony whereof I afiix m signature.

ELLIS ISKER.

